Winthrop, WA Weather & Growing Conditions
Today
64°F
Haze
Haze and areas of smoke before 3pm, then smoke and haze. Sunny, with a high near 64. Southwest wind 2 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Haze | 2 to 9 mph SW | 0% |
| Tonight | 49°F | Smoke | 5 to 9 mph N | 0% |
| Wednesday | 67°F | Smoke | 3 to 13 mph S | 0% |
| Wednesday Night | 50°F | Areas Of Smoke | 7 to 13 mph NW | 0% |
| Thursday | 70°F | Sunny | 5 to 13 mph W | 0% |
| Thursday Night | 52°F | Mostly Clear | 9 to 13 mph NW | 0% |
| Friday | 67°F | Sunny | 10 to 18 mph NW | 0% |
| Friday Night | 50°F | Mostly Clear | 12 to 18 mph NW | 0% |
| Saturday | 63°F | Mostly Sunny | 10 to 18 mph W | 0% |
| Saturday Night | 45°F | Partly Cloudy | 15 to 18 mph W | 0% |
| Sunday | 61°F | Sunny | 10 to 17 mph NW | 0% |
| Sunday Night | 46°F | Partly Cloudy | 14 to 17 mph W | 0% |
| Monday | 61°F | Sunny | 7 to 14 mph W | 1% |
| Monday Night | 46°F | Partly Cloudy | 14 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Winthrop, WA
Last spring frost
May 9
First fall frost
Sep 29
Growing season
142 days
Hardiness zone
6a
Explore more for Winthrop, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Mazama, Wa (12.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.